Method for reducing the noise generated by a hole under a high energy gas flow

Abstract

According to the invention, at least part of the edge of the hole is loosely surrounded with a mesh structure so as to create a space between the latter and said edge part.

1. A method for reducing the noise generated by an orifice placed in an energetic gas flow,
 wherein at least part of the edge of said orifice is loosely surrounded with a mesh structure so as to create a space between the latter and said edge part, 
 said mesh structure 
 dividing said energetic gas flow into a plurality of less energetic secondary gas flows passing through said space to reach said edge part, and 
 breaking up the sound waves generated by said edge part under the action of said less energetic secondary gas flows. 
 
     
     
       2. The method as claimed in  claim 1 , wherein, when the angle of incidence of said flow is normal to said orifice, said mesh structure is positioned around the entire edge of said orifice. 
     
     
       3. The method as claimed in  claim 1 , wherein, when the angle of incidence of said flow is at a grazing angle to said orifice, said mesh structure is arranged at least around the downstream part of said orifice. 
     
     
       4. The method as claimed in  claim 1 , wherein: at least part of the edge of said orifice is chamfered; and said mesh structure is fixed to said chamfered part in such a way as to form said space between the latter and said mesh structure. 
     
     
       5. The method as claimed in  claim 1 , wherein, with the meshes of said mesh structure consisting of filaments criss-crossing one another, some of said filaments are orthogonal to at least part of the edge of said orifice and others are parallel thereto. 
     
     
       6. The method as claimed in  claim 1 , wherein said mesh structure is made of a metallic material. 
     
     
       7. A method comprising employing a mesh structure to reduce noise generated by an orifice in a first gas flow,
 wherein the mesh structure surrounds an edge part of the orifice, 
 wherein a space exists between the mesh structure and the edge part, 
 wherein the mesh structure divides the first gas flow into a plurality of secondary gas flows passing through the space toward the edge part, 
 wherein each secondary gas flow is less energetic than the first gas flow, 
 wherein the mesh structure decreases the intensity of sound waves generated by said edge part under the action of the secondary gas flows.